Marking and Colorizing Invoices - Keeping track of certain invoices

Tasks have the ability to colorize urgencies. I believe this will help us figure out what invoices are more urgent than others. (I know that the exclamation graphic is supposed to do this, but I don't think it stands out so much. especially since it shows up right away if you make the invoice due immediately). The Urgency Color gives us the ability to decide what is more relevant.

Of course I think this should be customizable considering the differing problems with collections each company meets.

Light Blue - Not a problem
Green - Go Get your money
Yellow - Delinquent
Orange - Break some Knee caps
Red - Send to collections
Black - Bad Debt

Also a nice thing would be marking the Invoices. Marking them (with a check box or something) tells us we have already reviewed this in our Invoice meetings. We can check and uncheck and the cookie can be set to each personal computer.